package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    public void addCart(ShoppingCartDTO shoppingCartDTO) {
        //分辨是套餐还是菜品
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);//?

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //如果存在就让number++
        if(list != null && list.size()>0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateByNumber(cart);
        }else{
            //如果不存在就加一条数据
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId != null){
                //本次添加的是菜品
                Dish dish = dishMapper.getById(shoppingCart.getDishId());
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else{
                Setmeal dish = setmealMapper.getSetmealById(shoppingCart.getSetmealId());
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());

            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     */
    public List<ShoppingCart> select() {
        Long userId = BaseContext.getCurrentId();

        return shoppingCartMapper.select(userId);
    }

    /**
     * 删除购物车的一个商品
     * @param shoppingCartDTO
     */
    @Override
    public void deleteCart(ShoppingCartDTO shoppingCartDTO) {

        //如果有number则number--
        ShoppingCart cart =shoppingCartMapper.selectById(shoppingCartDTO);
        if(cart.getNumber()>1){
            cart.setNumber(cart.getNumber()-1);
            shoppingCartMapper.changeNumberById(cart);
        }else{
            shoppingCartMapper.deleteById(cart);
        }

    }
}
